JP7004998B2 - Plugs and connectors - Google Patents

Description

The present invention relates to plugs and connectors.

Generally, liquids such as chemicals and general chemicals used in semiconductor manufacturing equipment are filled in storage containers such as glass bottles and tanks at production plants, and shipped with a lid attached to the opening formed in the storage container. Will be done. In order to take out the liquid stored in such a storage container, a siphon tube type connector is known in which a gas such as air is introduced into the storage container and the liquid is sent out of the storage container by the pressure (for example). , Patent Document 1).

Japanese Patent No. 5048968

The device disclosed in Patent Document 1 has a bottle cap attached to an opening of a container, a socket portion inserted into the bottle cap, and a plug portion inserted into the socket portion. In Patent Document 1, a bottle cap is required separately from the connector structure including the socket portion and the plug portion. Therefore, the number of parts constituting the device increases, and the structure becomes complicated.

On the other hand, if the plug part is attached to the opening of the container without using the bottle cap and the socket part is attached to the plug part, when the socket part is rotated to remove it from the plug part, the plug part also rotates at the same time. There is a possibility that it will end up. In this case, the plug portion may rotate and come off from the opening, and the liquid inside the container may leak from the opening to the outside.

The present invention has been made in view of such circumstances, and has a problem that the plug comes off from the opening of the liquid storage container and the liquid leaks while realizing a structure for taking out the liquid from the liquid storage container with a simple structure. It is intended to provide a plug with protection and a connector with it.

In the present invention, the following means are adopted in order to solve the above-mentioned problems.
The plug according to one aspect of the present invention is attached to a liquid storage container having a cylindrical opening having a first male screw formed on the outer peripheral surface at the upper end and a handle protruding laterally from the opening. , A main body attached along the inner peripheral surface of the opening, a siphon tube connected to the lower end of the main body and inserted toward the bottom surface of the liquid storage container, and fastened to the first male screw. The first female screw and the second female screw fastened to the second male screw formed on the other member are formed on the inner peripheral surface and are formed in a cylindrical shape along the axis, and the nut is the other. The member is provided with a rotation prevention portion for preventing rotation in the release direction in which the fastening with the first male screw is released, and the rotation prevention portion is more than the handle in a state of being attached to the nut. When there is a rotation prevention member arranged on the upstream side in the release direction, and the rotation prevention member is attached to the nut, and a force for rotating in the release direction is transmitted from the other member to the nut. , The nut is restricted from rotating about the axis with respect to the rotation prevention portion.

According to the plug according to one aspect of the present invention, the nut is formed by fastening the first female screw of the nut to the first male screw of the opening with the main body attached to the inner peripheral surface of the opening of the liquid storage container. Attached to the opening. Further, by fastening the second male screw of the other member to the second female screw of the nut, the other member is attached to the nut. When rotating in the release direction to remove another member from the nut, the force to rotate in the release direction is transmitted from the other member to the nut.

Here, it is regulated that the nut rotates about the axis with respect to the rotation prevention portion with the rotation prevention portion inserted in the nut. Therefore, when the nut rotates in the release direction, the rotation prevention portion also rotates in the release direction together with the nut. Then, in a state of being attached to the nut, a rotation prevention member is arranged on the upstream side in the release direction from the handle. Therefore, even if the nut rotates in the release direction, the rotation prevention member comes into contact with the handle, and the rotation prevention portion is prevented from rotating in the release direction. Further, the nut that rotates integrally with the rotation prevention portion is also prevented from rotating in the release direction. Therefore, even if the nut rotates in the release direction, the nut does not further rotate in the release direction after the rotation prevention member comes into contact with the handle.
As described above, according to the plug according to one aspect of the present invention, the structure for taking out the liquid from the liquid storage container is realized by a simple structure, and the problem that the plug comes off from the opening of the liquid storage container and the liquid leaks is prevented. can do.

In the plug according to one aspect of the present invention, a protrusion protruding outward with respect to the axis is formed on the outer peripheral surface at the lower end of the nut, and the axis is formed on the inner peripheral surface of the rotation prevention portion. A groove portion extending in the circumferential direction is formed, and the rotation prevention portion may be configured to be fixed to the nut with the protrusion portion press-fitted into the groove portion.
According to the plug of this configuration, the rotation prevention portion is fixed to the nut in a state where the protrusion is press-fitted into the groove. Therefore, it is possible to prevent the rotation prevention portion from being inadvertently removed from the nut after the rotation prevention portion is attached to the nut.

In the plug according to one aspect of the present invention, the rotation prevention member is formed so as to be arranged on the upstream side of the handle in the release direction before the protrusion is press-fitted into the groove. ..
By doing so, even if the operator applies a strong force to the rotation prevention portion when the protrusion is press-fitted into the groove portion, the rotation prevention member rotates in the release direction due to the force, and the rotation prevention member is in the release direction rather than the handle. It is possible to prevent a problem that the device is placed on the downstream side by mistake.

The plug according to one aspect of the present invention has the second male screw fastened to the second female screw and includes a sealing portion for preventing the liquid stored in the liquid storage container from flowing out to the outside. You may.
By doing so, while preventing the problem that the liquid flows out from the siphon tube through the main body due to the sealing portion, the nut rotates together with the sealing portion when the sealing portion is removed from the nut, and the nut rotates from the opening. It is possible to prevent the problem of coming off.

The connector according to one aspect of the present invention has the plug according to any one of the above and the second male screw fastened to the second female screw, and externally collects the liquid taken out from the liquid storage container via the plug. It is equipped with a socket to supply to.
According to the connector according to one aspect of the present invention, the nut rotates together with the socket and comes off from the opening when the socket is removed from the nut, while the socket enables the liquid to be taken out from the liquid storage container and supplied to the outside. It is possible to prevent problems that occur.

According to the present invention, there is provided a plug and a connector provided with the plug, which realizes a structure for taking out a liquid from the liquid storage container with a simple structure and prevents a problem that the plug comes off from the opening of the liquid storage container and the liquid leaks out. can do.

It is a partial vertical sectional view which shows one Embodiment of a liquid extraction system. It is a partially enlarged view of the connector part of the liquid extraction system shown in FIG. It is a figure which shows the state which attached the sealing cap to the plug of the liquid extraction system shown in FIG. It is a disassembly assembly drawing of the plug shown in FIG. It is a figure which shows the state before attaching the lock ring to a fixing nut. It is a figure which shows the state which a part of the lock ring is inserted into a fixing nut. It is a figure which shows the state before the protrusion of the fixing nut is press-fitted into the groove of the lock ring. FIG. 7 is a right side view of the liquid extraction system shown in FIG. 7. FIG. 3 is a plan view of the liquid extraction system shown in FIG. 8 as viewed from above. It is a figure which shows the modification which attached the light-shielding cap to the plug shown in FIG.

Hereinafter, the liquid extraction system 100 according to the embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the liquid extraction system 100 of the present embodiment includes a plug 10, a socket 20, and a liquid storage container 30.
The liquid extraction system 100 guides a pressurizing gas to the internal space S1 of the liquid storage container 30 via the socket 20 to pressurize the internal space S1, and liquid (in a semiconductor manufacturing apparatus) via a connector composed of a plug 10 and a socket 20. It is a system that takes out the chemicals used) to the outside.

Here, the socket 20 included in the liquid extraction system 100 will be described.
The socket 20 guides the pressurizing gas supplied from the external pressurizing gas supply source (not shown) to the internal space S1 of the liquid storage container 30, and is taken out from the liquid storage container 30 by pressurizing the internal space S1. It is a device that supplies liquid to the outside. The socket 20 includes a socket body 21, a mounting ring 22, a valve 23, an O-ring 24, and an O-ring 25.

The socket body 21 is a member formed in a substantially cylindrical shape along the X direction of the axis. Inside the socket body 21, a liquid flow path 21a extending in the X direction of the axis is formed. At the upper end of the liquid flow path 21a, a pipe mounting portion 21b having a female thread formed on the inner peripheral surface is provided. A pipe (not shown) that guides the liquid to the outside is attached to the pipe mounting portion 21b.

Inside the socket body 21, a gas flow path 21c that penetrates the socket body 21 from the upper end to the lower end is formed. At the upper end of the gas flow path 21c, a pipe mounting portion 21d having a female screw formed on the inner peripheral surface is provided. A pipe (not shown) that guides the pressurizing gas supplied from an external supply source (not shown) to the plug 10 is attached to the pipe mounting portion 21d.

A valve seat 21e is provided below the liquid flow path 21a of the socket body 21. The valve body 23a is in contact with the valve seat 21e of the socket 20 that is not attached to the plug 10 due to the urging force of the spring 23c of the valve 23. In this state, the position where the valve seat 21e and the valve body 23a come into contact is the seal region, and the flow of the liquid is blocked in the seal region.

The mounting ring 22 is a member for fixing the socket body 21 to the plug 10. The mounting ring 22 is a member formed in a cylindrical shape along the axis X. An endless annular protrusion 22a extending around the axis X is formed on the inner peripheral surface of the mounting ring 22. On the other hand, an endless annular groove portion 21f extending around the axis X is formed on the outer peripheral surface of the socket main body 21.

As shown in FIG. 2, the annular protrusion 22a is engaged with the annular groove 21f formed in the socket body 21. Therefore, the mounting ring 22 is in a state of being relatively rotatable about the axis X with respect to the socket main body 21. Further, a male screw 22b is formed on the outer peripheral surface below the mounting ring 22. The socket 20 is fixed to the plug 10 by fastening the male screw 22b of the mounting ring 22 to the female screw 13b formed on the inner peripheral surface above the fixing nut 13 of the plug 10.

The valve 23 is a mechanism for switching between communicating and blocking the liquid flow path 11a of the plug 10 and the liquid flow path 21a of the socket 20. The valve 23 has a valve body 23a, an end portion 23b, and a spring 23c.
The end portion 23b is a cylindrical member having a male screw formed on the outer peripheral surface, and is fastened to a female screw formed on the inner peripheral surface below the liquid flow path 21a of the socket body 21. The end 23b supports one end of the spring 23c. The other end of the spring 23c is held by the valve body 23a. Therefore, the valve body 23a is provided with an urging force in the direction of contacting the valve seat 21e along the axis X by the spring 23c.

As shown in FIG. 2, when the socket 20 is attached to the opening 31 of the liquid storage container 30, the valve operating portion 11d of the plug 10 comes into contact with the tip portion 23d of the valve body 23a, and the valve body 23a is aligned with the axis X. Push up along. When the valve body 23a is pushed upward, the liquid flow path 21a of the socket 20 and the liquid flow path 11a of the plug 10 are in a state of communicating with each other through the through hole 11c.

The O-ring 24 is an elastic member that forms a seal region between the O-ring 24 and the plug body 11 when the plug body 11 of the plug 10 is inserted into the socket body 21. The O-ring 25 is an elastic member that forms a seal region between the socket 20 and the upper end of the flange portion 11f of the plug body 110 when the socket 20 is attached to the opening portion 31 of the liquid storage container 30.

Next, the plug 10 included in the liquid extraction system 100 will be described.
As shown in FIGS. 2 and 3, as shown in FIG. 2, the plug 10 includes a plug main body (main body portion) 11, a siphon tube 12, a fixing nut 13, and a lock ring (rotation prevention portion) 14. It has a packing 15 and a sealing cap 16. Each member of the plug 10 except the packing 15 is made of a resin material (for example, HDPE (high density polyethylene)). As shown in FIG. 2, the plug 10 is attached to the opening 31 of the liquid storage container 30.

The plug main body 11 is a cylindrical member attached along the inner peripheral surface 31b of the opening 31 of the liquid storage container 30. As shown in FIG. 4, the plug main body 11 has a liquid flow path 11a, a gas flow path 11b, a through hole 11c, a valve operation portion 11d, and a flange portion 11f.

The liquid flow path 11a is a flow path that guides the liquid contained in the liquid storage container 30 from the siphon tube 12 to the through hole 11c.
The gas flow path 11b is a flow path that guides the pressurizing gas supplied from the pressurizing gas supply source (not shown) connected to the socket 20 to the internal space S1 of the liquid storage container 30. By guiding the pressurizing gas to the internal space S1, the liquid is pushed out from the siphon tube 12 toward the liquid flow path 11a. The gas flow paths 11b are provided at a plurality of locations (for example, four locations of 90 ° each) around the axis X.

The through hole 11c is a hole that guides the liquid guided from the liquid flow path 11a to the liquid flow path 21a of the socket 20. Through holes 11c are provided at a plurality of locations (for example, four locations of 90 ° each) around the axis X.
The valve operating portion 11d is a member that pushes up the valve 23 of the socket 20 along the axis X when the socket 20 is attached to the plug 10. By pushing up the valve 23 of the socket 20, liquid is guided from the through hole 11c toward the liquid flow path 21a of the socket 20.

The flange portion 11f is an annular member connected to the upper end of the plug main body 11 and having a diameter larger than the diameter of the inner peripheral surface 31b of the opening 31 of the liquid storage container 30.
A packing 15 is attached to the lower surface of the flange portion 11f. The packing 15 is an annular elastic member extending around the axis X, and is formed of, for example, an elastic body such as foamed polyethylene or fluororubber having chemical resistance.

The lower surface of the flange portion 11f is locked to the upper end 31c of the opening 31 via the packing 15 in a state where the plug 10 is attached to the opening 31 of the liquid storage container 30. As a result, the plug 10 is prevented from being drawn from the opening 31 to the internal space S1.

As shown in FIG. 1, the siphon tube 12 is a tubular member that extends in the X direction of the axis and is inserted toward the bottom surface 30a of the liquid storage container 30.
As shown in FIG. 3, the siphon tube 12 is connected to the lower end of the plug main body 11 and is inserted so as to surround the portion of the plug main body 11 forming the liquid flow path 11a. The siphon tube 12 and the edge portion 11e formed on the plug main body 11 form an endless sealing region around the axis X at the contact position where they come into contact with each other. This sealing area prevents the inside of the siphon tube 12 and the internal space S1 of the liquid storage container 30 from communicating with each other.

The fixing nut 13 is a member in which a female screw (first female screw) 13a is formed below the inner peripheral surface and a female screw (second female screw) 13b is formed above the inner peripheral surface. As shown in FIGS. 3 and 4, the fixing nut 13 is a member formed in a cylindrical shape so as to extend along the axis X. The female screw 13a is fastened to the male screw 32 formed on the outer peripheral surface 31a of the opening 31 of the liquid storage container 30. The female screw 13b is fastened to the male screw 16c formed on the sealing cap 16 or the male screw formed on the mounting ring 22 of the socket 20.

Although the fixing nut 13 is made of a resin material (for example, HDPE (high density polyethylene)), it is desirable to use a resin material mixed with a coloring agent having a light-shielding property against ultraviolet rays and the like. By using a resin material having a light-shielding property, it is possible to suppress a problem that the chemical solution is cured by ultraviolet rays or the like.

The fixing nut 13 is fastened to the opening 31 by rotating in the clockwise fastening direction about the axis X in a state where the lower end of the female screw 13b is in contact with the upper end of the male screw 32 of the opening 31. On the other hand, the fixing nut 13 is released from being fastened to the opening 31 by rotating in the counterclockwise release direction about the axis X. A plurality of groove portions 13c extending along the axis X are formed on the outer peripheral surface of the fixing nut 13. Further, on the outer peripheral surface at the lower end of the fixing nut 13, a protrusion 13d that protrudes outward with respect to the axis X and extends in the circumferential direction around the axis X is formed.

The lock ring 14 is a member that prevents the fixing nut 13 from rotating together with another member (sealing cap 16 or mounting ring 22) in the release direction in which the fastening with the male screw 32 is released. As shown in FIGS. 3 and 4, a protrusion 14a extending along the axis X and projecting inward is formed on the inner peripheral surface of the lock ring 14. Further, as shown in FIGS. 8 and 9, the lock ring 14 is arranged so as to sandwich both the upstream side and the downstream side of the handle 33 in the release direction while being attached to the fixing nut 13. Has. Further, as shown in FIG. 4, a groove portion 14c extending in the circumferential direction around the axis X is formed on the inner peripheral surface of the lock ring 14.

Here, a step of attaching the lock ring 14 to the fixing nut 13 attached to the opening 31 of the liquid storage container 30 will be described with reference to FIGS. 5 to 7.
As shown in FIG. 5, before attaching the lock ring 14 to the fixing nut 13, the operator inserts the plug body 11 into the opening 31 of the liquid storage container 30 and opens the female screw 13a of the fixing nut 13. It is fastened to the male screw 32 of 31. Further, the operator fastens the male screw 16c of the sealing cap 16 to the female screw 13b of the fixing nut 13. Then, the operator arranges the lock ring 14 above the fixing nut 13 so that the position of the rotation prevention member 14b in the circumferential direction around the axis X is aligned with the handle 33.

Next, as shown in FIG. 6, the operator moves the lock ring 14 downward along the axis X with the outer peripheral surface of the fixing nut 13 and the inner peripheral surface of the lock ring 14 aligned with each other. As shown in FIG. 6, the lock ring 14 moves downward along the axis X in a state where the protrusion 14a of the lock ring 14 is engaged with the groove portion 13c of the fixing nut 13, and is in the state shown in FIG. Since the protrusion 14a of the lock ring 14 is engaged with the groove 13c of the fixing nut 13, the fixing nut 13 is restricted from rotating about the axis X with respect to the lock ring 14.

FIG. 7 is a diagram showing a state in which a part of the lock ring 14 is inserted into the fixing nut 13. In the state shown in FIG. 7, the protrusion 13d of the fixing nut 13 is not engaged with the groove 14c of the lock ring 14. This is because the outer diameter of the protrusion 13d of the fixing nut 13 centered on the axis X is larger than the inner diameter of the groove portion 14c of the lock ring 14 centered on the axis X. The operator elastically deforms the lock ring 14 so that the inner diameter of the groove 14c is expanded by pressing the lock ring 14 downward along the axis X from the state shown in FIG. 7. When the lock ring 14 is elastically deformed, the protrusion 13d is inserted into the groove 14c. As a result, the lock ring 14 is fixed to the fixing nut 13 in a state where the protrusion 13d is press-fitted into the groove 14c (the state shown in FIG. 3).

As shown in FIG. 7, the rotation prevention member 14b of the lock ring 14 is arranged so as to sandwich both the upstream side and the downstream side of the handle 33 before the protrusion 13d is press-fitted into the groove portion 14c. In this way, even if the operator applies a strong force to the lock ring 14 when the protrusion 13d is press-fitted into the groove 14c, the rotation prevention member 14b rotates in the release direction due to the force, and the handle 33 This is to prevent a problem that the device is placed on the downstream side in the release direction.

As shown in FIGS. 8 and 9, when the protrusion 13d is press-fitted into the groove 14c, the handle 33 is inserted into the notch 14d of the rotation prevention member 14b, and the upstream side and the downstream side in the release direction of the handle 33 are It is sandwiched between the rotation prevention members 14b. In this state, the fixing nut 13 cannot be rotated in the release direction. This is because the fixing nut 13 is restricted from rotating around the axis X with respect to the lock ring 14, and the lock ring 14 is restricted from rotating around the axis X by the rotation prevention member 14b.

As shown in FIG. 9, the protrusions 14a of the lock ring 14 are provided at four positions at equal intervals of 90 ° around the axis X. By engaging the four protrusions 14a with the groove 13c of the fixing nut 13, the fixing nut 13 is restricted from rotating about the axis X with respect to the lock ring 14. Here, the protrusions 14a are arranged at four locations at equal intervals of 90 °, but may be any two or more locations.

The packing 15 is a member in which the plug 10 is attached to the opening 31 of the liquid storage container 30 and is in contact with the upper end 31c of the opening 31 over the entire circumference around the axis X. The contact between the upper end 31c of the opening 31 and the packing 15 forms an endless sealing region extending around the axis X. Therefore, even when the internal space S1 of the liquid storage container 30 is pressurized by the pressurizing gas, it is possible to suppress the problem that the pressurizing gas leaks to the outside through the gap between the opening 31 of the liquid storage container 30 and the plug 10. Can be done.

The sealing cap (sealing portion) 16 prevents the liquid stored in the liquid storage container 30 from flowing out to the outside through the plug 10. As shown in FIGS. 3 and 4, the sealing cap 16 has a sealing member 16a and a cap member 16b connected to the sealing member 16a. Further, a male screw 16c is formed on the outer peripheral surface of the sealing cap 16. The male screw 16c is fastened to the female screw 13b formed above the inner peripheral surface of the fixing nut 13.

The sealing cap 16 is fastened to the fixing nut 13 by rotating in the clockwise fastening direction about the axis X with the lower end of the male screw 16c in contact with the upper end of the female screw 13b of the fixing nut 13. On the other hand, the sealing cap 16 is released from being fastened to the fixing nut 13 by rotating in the counterclockwise release direction about the axis X.

The cap member 16b of the sealing cap 16 is made of a resin material (for example, HDPE (high density polyethylene)), but it is desirable to use a resin material mixed with a colorant having a light-shielding property against ultraviolet rays and the like. .. By using a resin material having a light-shielding property, it is possible to suppress a problem that the chemical solution is cured by ultraviolet rays or the like.

Next, the liquid storage container 30 included in the liquid extraction system 100 will be described.
As shown in FIG. 4, the liquid storage container 30 is a container formed in a cylindrical shape along an axis X extending in the vertical direction as shown in FIG. 1, and can store a liquid inside. The liquid storage container 30 is made of a chemical resistant resin material (for example, HDPE (high density polyethylene)).

The liquid storage container 30 is a container in which a cylindrical opening 31 having a male screw (first male screw) 32 formed on the outer peripheral surface 31a is formed at the upper end. The liquid storage container 30 internally stores the liquid (chemical liquid or the like used in the semiconductor manufacturing apparatus) injected through the opening 31. As shown in FIG. 4, the liquid storage container 30 has a handle 33 that projects laterally from the opening 31. By grasping the handle 33 by hand, the operator can easily carry the liquid storage container 30 in which the liquid is stored.

The actions and effects of the present embodiment described above will be described.
According to the plug 10 of the present embodiment, the female screw 13a of the fixing nut 13 is fastened to the male screw 32 of the opening 31 with the plug main body 11 attached to the inner peripheral surface 31b of the opening 31 of the liquid storage container 30. , The fixing nut 13 is attached to the opening 31. Further, by fastening the male screw 16c of the sealing cap 16 or the male screw 22b of the mounting ring 22 to the female screw 13b of the fixing nut 13, another member (sealing cap 16 or mounting ring 22) is attached to the fixing nut 13. When the other member is rotated in the release direction in order to remove it from the fixing nut 13, the force for rotating the other member in the release direction is transmitted from the other member to the fixing nut 13.

Here, with the lock ring 14 inserted in the fixing nut 13, the fixing nut 13 is restricted from rotating about the axis X with respect to the lock ring 14. Therefore, when the fixing nut 13 rotates in the release direction, the lock ring 14 also rotates in the release direction integrally with the fixing nut 13. The rotation prevention member 14b is arranged on the upstream side in the release direction from the handle 33 in a state of being attached to the fixing nut 13. Therefore, even if the fixing nut 13 rotates in the release direction, the rotation prevention member 14b comes into contact with the handle 33, and the lock ring 14 is prevented from rotating in the release direction. Further, the fixing nut 13 that rotates integrally with the lock ring 14 is also prevented from rotating in the release direction. Therefore, even if the fixing nut 13 rotates in the release direction, the fixing nut 13 does not further rotate in the release direction after the rotation prevention member 14b comes into contact with the handle 33.
As described above, according to the plug 10 of the present embodiment, the plug 10 is disengaged from the opening 313 of the liquid storage container 30 and the liquid leaks out while realizing the structure of taking out the liquid from the liquid storage container 30 with a simple structure. Can be prevented.

In the plug 10 of the present embodiment, a protrusion 13d is formed on the outer peripheral surface at the lower end of the fixing nut 13 so as to project outward with respect to the axis X, and the inner peripheral surface of the lock ring 14 is around the axis X. A groove portion 14c extending in the circumferential direction of the above is formed. Further, the lock ring 14 is fixed to the fixing nut 13 in a state where the protrusion 13d is press-fitted into the groove 14c.
According to the plug 10 of the present embodiment, the lock ring 14 is fixed to the fixing nut 13 in a state where the protrusion 13d is press-fitted into the groove 14c. Therefore, it is possible to prevent the lock ring 14 from being inadvertently removed from the fixing nut 13 after the lock ring 14 is attached to the fixing nut 13.

In the plug 10 of the present embodiment, the rotation prevention member 14b is in a state of being arranged on the upstream side in the release direction from the handle 33 before the protrusion 13d is press-fitted into the groove portion 14c.
By doing so, even if the operator applies a strong force to the lock ring 14 when the protrusion 13d is press-fitted into the groove 14c, the rotation prevention member 14b rotates in the release direction due to the force, and the handle 33 However, it is possible to prevent a problem that the ring is placed on the downstream side in the release direction.

[Other embodiments]
In the above description, the rotation prevention member 14b of the lock ring 14 is arranged so as to sandwich both the upstream side and the downstream side of the handle 33 in the release direction while being attached to the fixing nut 13. Other embodiments may be used. For example, the rotation prevention member 14b of the lock ring 14 may be arranged only on the upstream side of the handle 33 in the release direction while being attached to the fixing nut 13. Even if the rotation prevention member 14b is arranged only on the upstream side of the handle 33 in the release direction, the rotation prevention member 14b comes into contact with the handle 33 when the fixing nut 13 is rotated in the release direction, so that the problem that the fixing nut 13 comes off is prevented. Will be done.

Further, in the above description, the sealing cap 16 is a combination of the sealing member 16a and the cap member 16b. Further, although it is desirable to use a resin material mixed with a colorant having a light-shielding property against ultraviolet rays or the like for the cap member 16b, other embodiments may be used. For example, in the liquid extraction system 100A according to the modification shown in FIG. 10, the sealing cap 16A of the plug 10A is formed of a single member, and the light-shielding cap 17 having a light-shielding property is arranged so as to cover the sealing cap 16A. It may be configured to be used. In this configuration, the sealing cap 16A can be formed of a resin material that does not contain a colorant. Therefore, it is advantageous that the liquid contained in the liquid storage container 30 is not contaminated by the colorant.

10 plug 11 plug body (main body)
12 Siphon tube 13 Fixing nut 13a Female thread (1st female thread)
13b Female screw (2nd female screw)
13c Groove 13d Protrusion 14 Lock ring (rotation prevention part)
14a Protrusion 14b Rotation prevention member 14c Groove 14d Notch 15 Packing 16 Sealing cap (sealing)
16a Sealing member 16b Cap member 16c Male thread (second male thread)
17 Light-shielding cap 20 Socket 21 Socket body 22 Mounting ring 22a Circular protrusion 22b Male screw 23 Valve 24, 25 O-ring 30 Liquid storage container 30a Bottom 31 Opening 31a Outer peripheral surface 31b Inner peripheral surface 31c Upper end 32 Male screw (first male screw)
33 Handle 100 Liquid take-out system S1 Internal space X axis

Claims (5)

A plug attached to a liquid storage container having a cylindrical opening having a first male screw formed on the outer peripheral surface at the upper end and a handle protruding laterally from the opening.
A main body mounted along the inner peripheral surface of the opening, and
A siphon tube connected to the lower end of the main body and inserted toward the bottom surface of the liquid storage container.
A nut in which a first female screw fastened to the first male screw and a second female screw fastened to a second female screw formed on another member are formed on the inner peripheral surface and formed in a cylindrical shape along an axis. When,
A rotation preventing portion for preventing the nut from rotating together with the other member in the releasing direction in which the fastening with the first male screw is released is provided.
The rotation prevention portion has a rotation prevention member which is arranged on the upstream side in the release direction with respect to the handle in a state of being attached to the nut.
When the rotation prevention portion is attached to the nut and a force for rotating the nut in the release direction is transmitted from the other member to the nut, the nut rotates about the axis with respect to the rotation prevention portion. Plugs that are regulated to do. A protrusion protruding outward with respect to the axis is formed on the outer peripheral surface at the lower end of the nut.
A groove extending in the circumferential direction around the axis is formed on the inner peripheral surface of the rotation prevention portion.
The plug according to claim 1, wherein the rotation prevention portion is fixed to the nut in a state where the protrusion is press-fitted into the groove. The plug according to claim 2, wherein the rotation prevention member is formed so as to be arranged on the upstream side of the handle in the release direction before the protrusion is press-fitted into the groove. Any one of claims 1 to 3 having the second male screw fastened to the second female screw and having a sealing portion for preventing the liquid stored in the liquid storage container from flowing out to the outside. The plug described in. The plug according to any one of claims 1 to 4, and the plug
A connector having the second male screw fastened to the second female screw and having a socket for supplying a liquid taken out from the liquid storage container to the outside through the plug.

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